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Science

Acids, Bases, and Salts

अम्ल, क्षारक और लवण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, students study acids, bases, and salts through their properties, reactions, and everyday examples. The topic explains how these substances behave with indicators and with one another, including neutralisation, and introduces the formation and practical importance of common salts.

Practice questions

What is the role of acid in damaging tooth enamel?If the pH of the mouth falls below 5, what situation develops for the teeth?Why does aqueous sodium chloride conduct electricity even though it is neutral?Turmeric turns reddish-brown in a solution. What property does this solution have?A solution turns blue litmus red but keeps phenolphthalein colourless. Which conclusion is correct?Which substance is useful in softening hard water?What is the basic reason for water formation in an acid-base reaction?If a solution has pH 3 and it is made one hundred times less acidic, what will be the approximate new pH?An unknown solid reacts with acid to give a gas that turns limewater milky. Which ion may be present in the solid?A metal oxide is added to an acid and salt and water are formed. What type of reaction is this?Considering carbon dioxide as a non-metal oxide, why does it react with lime water?Why did the risk increase when a student added water to acid for dilution?Sour food should not be stored in copper vessels. What is the scientific reason?If the hydrogen ion concentration in a solution increases ten times, what happens to the pH?Lime is added to improve acidic soil. What problem can occur if too much lime is added?What is a water-soluble base called?Which statement about chemical products related to common salt is correct?Methyl orange is red and phenolphthalein is colourless in a solution. What is the nature of the solution?A solution is diluted slowly, but its pH does not move far from 7 because it was already neutral. Which solution could it be?Which substance is important in both disinfecting and bleaching uses?